Atrial fibrillation is associated with impaired exercise capacity and adverse prognosis in patients with heart failure with mid-range ejection fraction. (December 2020) - Sato, Yu; Yoshihisa, Akiomi; Kimishima, Yusuke; Yokokawa, Tetsuro; Abe, Satoshi; Shimizu, Takeshi; Misaka, Tomofumi; Yamada, Shinya; Sato, Takamasa; Kaneshiro, Takashi; Oikawa, Masayoshi; Kobayashi, Atsushi; et al.